Advertisements
Advertisements
प्रश्न
Answer in brief.
Why should a Carnot cycle have two isothermal two adiabatic processes?
Advertisements
उत्तर
There are basically two processes:
- Exchange of heat (steps A to B and C to D). For this to be reversible, the heat exchange must be isothermal. This is possible if the working substance is at the temperature TH of the source while absorbing heat. The working substance should be at the temperature of the cold reservoir TC while rejecting the heat.
- Work done (steps B to C and D to A). For work done to be reversible, the process should be adiabatic.
Thus, the cycle includes two isothermal and two adiabatic processes for maximum efficiency.
Carnot cycle
APPEARS IN
संबंधित प्रश्न
For work done to be reversible, the process should be ______
What is a thermodynamic process?
Draw a p-V diagram showing negative work with varying pressure.
State the assumptions made for thermodynamic processes.
Explain graphically (i) positive work with varying pressure, (ii) negative work with varying pressure, and (iii) positive work at constant pressure.
Write a note on free expansion.
The V-T diagram of an ideal gas which goes through a reversible cycle A→B→C→D is shown below. (Processes D→A and B→C are adiabatic)
The corresponding PV diagram for the process is (all figures are schematic)
Give an expression for work done in an isothermal process.
Draw the PV diagram for the adiabatic process.
Draw the PV diagram for the isochoric process.
What is meant by a reversible and irreversible processes?
An ideal gas is made to go from a state A to stale B in the given two different ways (see figure) (i) an isobaric and then an isochoric process and (ii) an isochoric and then an isobaric process. The work done by gas in the two processes are W1 and W2 respectively. Then,
One mole of an ideal gas with `gamma` = 1.4 is adiabatically compressed so that its temperature rises from 27° C to 47° C. The change in the internal energy of the gas is (R = 8.3 J/mol.K) ____________.
In which of the following processes, beat is neither absorbed nor released by a system?
An ideal gas A and a real gas B have their volumes increased from V to 2V under isothermal conditions. The increase in internal energy ____________.
In an isothermal process, the volume of an ideal gas is halved. One can say that ____________.
We consider a thermodynamic system. If `Delta"U"` represents the increase in its internal energy and W the work done by the system, which of the following statements is true?
The work done on the system in changing the state of a gas adiabatically from equilibrium state A to equilibrium state B is 22.4 J. If the gas is taken from state A to B through another process in which the net heat absorbed by the system is 15.5 cal, then the net work done by the system in the latter case is ______.
( l cal = 4.2 J)
Consider P-V diagram for an ideal gas shown in figure.
Out of the following diagrams (figure), which represents the T-P diagram?
 (i) |
 (ii) |
 (iii) |
 (iv) |
In the figure shown here, the work done in the process ACBA is ______.
Explain how can a gas be expanded at constant temperature.
In a cyclic process, if ΔU = internal energy, W = work done, Q = Heat supplied then ______.
